Why must fans hate Hayley Price?

I've seen lots of comments or reviews saying "hate Hayley, she's stealing Auggie from Annie'' or to that effect. First, were A and A paired up together in the first place? Second, it this a love/romantic TV series or a spy-related series? The Hayley character has her flaws, but I dont get all the fan craze about her "stealing" or intruding into Auggie-Annie relationship (which so far isnt deep romantic at all)!